Scaffold



-rtnsw for Conveniently nd 331whichA are seeureditogetheri at'rghff l A.

' Weile A` tio provide aslcaioldjwhich may be yam-pivot ping'le tancesubstantially equal to the' diameter of the pipe 8,sov that the lattermaybe inserted therebetween, and atan elevation above the members 18 isanother pair of shorter but similar members 19, which are likewisespaced, andthe members 18 and 19 are connected together and Veach pairmounted in 1' the required spaced relation by members 20, 21and 22,thelatter of which proj ect vsoinewhat'above the members 19 and aresuitably spaced Ato engage against the lopposite sides f-'of the pipe 8and-serve as guides to permit sliding movement of the frame along thepipe 8. The members 18 project at onek side beyondthe members 19 andcarry a platform for supportingtheworkmen, said platform consisting ofone oivmore boards 23, which Vas n` "'hav'ecleats extending across theunder side'ladj acent each end to engage between the strips 18 of thesliding frames of two spaced standards forliolding the boards 28 againstdisplacement?, rlhe outerv ends ofthe mein,l bers 18 Yare connected vby,an end cleat i25 y which serves to hold said members in proper spacedrelation and engages thepen'ds of the cleats 24iso as to' preventdisplacement lof the boards 23 endwise-froni the members 18..

. A 'platform' is alsoprovided V on the meinthe workmen, as. forexample, the bricks and mortar in masonry construction, saidplatformconsisting of ak number of boards 26 connected ,to va drum 32 ofa windlasswhich is journaled in a bracket 83 mounted on the other'guide,22.*` This drumhas a ratchet wheel Sil at' oneend operableby apawl V35fon aswinging armV 36v which jis pivoted on n the shaft 37 which carriestliedrnm 32, and

.the outer end of the arm 36 isfor'med Awith a sockettorreceive the baror pipe38 which affords suiicientgleverage tov operate vv'the windlass.4Aholdingl pawl 39 is pivoted on i lthe Ibracket 33 to engage theteeth'ofthe `ratchet wheel 23A-to look the drum in various positions towhich it may be adjusted.Vv

A. large part of the work which isfrerquired k.to be yd oneon-scaffoldsnecessitates the. furnishing of materialsv to Vthe workmen on thesealfoldfrom-time to timerandinorder that this mayv be convenientlyYdone without interfering with. the workmen, :1j have constructedmyscaffold so that.; a -runway or platform] inayi-be .inountedat theopposite i side of the scaffold froml'the ,platform 23 on which'thc'workmenstand.. lTo this end bers 191for'supporting the materialsused vby there are extensions 40 which vare ,detachably secured by'bolts l1 orv other suitable'fastenings between the ends Aof the members18V for supporting'boa'rds Ll2 composing the runway or platfornrr riheouter ends-of the eX-v tensions a() are each provided with a U- shapedIstrap 13 through which a 2 n et or other suitable supporting post 111imay be inserted and cam i5 ispivoted betweenth-e two arms of the strap43 so th'ata'vlien itisrotated to the position'shown by full lines inFig. 1, it serves toiclampthe post againsttlie outer-end of the strap43, the .saidoi'iter end being' rpreferably formed as shownfin Fig. 1,with edges whichV bite into the-.outer edge of the post 44 and insure asubstantial first set yup adjacent the Yplace where the work is tok be'performed and .the sliding 'frames mounted on theistandards andtheplatforms 26-27 and 23 assembled thereon connection the extensions '440with the post'.V in using this scaffold the standards are.

with the latter arranged close to the location where the work is to beperformed.V The" braces 14 however, are not installed and thiis permitthe'sliding platform t'o Lbe arranged as shown by dotted lines in Fig.l, -veryclose to. the floor on 'which the standjardlsfare mountecha pairlof cleats i6 being preferably provided at the ends of the strip 2 and'correiitting 5to aord arest for` the slidingmem- Y bers in thelowermost position..

eratedto wind up the'cable 31 and thereby raises the sliding framesV andthe platforms thereon, so that the workmen may be'posi-v Asthe work'progresses the windla'ss isoptioned .at all times atthe'elevation" mostcon- 1 venient for llberformingvv the work." After thev seai'iolds havebeenfelevatedv to al point abovetheopenings 16, the brace rodslllarethen applied toreinforce the 5 standards yagainst lateral straindue toweight ofthe workmenand materials on'gthe elevated scaf-` fold. Asthefwork begins, the platform 26.-'27 for thefmaterialsis suiicientlycloseV tothe floorrso that the materialsV maybe -readilyl brought yupand placed ,onsaid'platf Yform from the floor,fbut as the scaffold is ielevated, it @is desirablef'to' have an elevatedl vplatformfor bringingup materialsto theV workmen.l ,'l'lierefore, after the scaffold has beenelevated somewhat the extensions '40 are mounted inplace with theouterVVends Aconnected with supports k@A and YVthe platform 4t2 assembled onthe extensionsAO and 1 an inclined runway -inay-'be constructed 'jup toythe platform'll2softliat materials may be Therefore, whenever thescadold is elevated, the cam member 45'is first swung to the. po-

sition shown by dotted lines inFig. 1 toreleasethe extensions4 4()VfromV the ypost lill and as the scaold iselevated the extensions ll()readily Vwheeled up` on to the' platform`-42. l I and deposited on vtheplatformf`26-27.

spondiiigiii thickness to the'flange of the and platform 42 'arelilrevvise'elevated; and

. when the proper elevation 1 is reached, the camjmember 45 isreturnedtothe position shown by-ull'lines' in Fig. l, to rclamp thevr`out en@ of the extensions@ to the; Sap# POFtiIlg post/14.1. 1Y

. The elevated platform is desirable in most constructionv Work tosupport the l l materials at an elevation convenient for the lo Workmanso vthathe doesnothave to stoop over to take up the materials to be usedin tlie Work,V butthis platform' 26-,27 may' oi course,v befdispensedWitli if desired and merely-"a single'platform provided. Y Y 15 Iclaim'was'm'y invention: Y

p'airof trame members on opposite sides of and Vextending horizontally'at right angles 'toj'tlie upriglits, a platform'-lextending between'land j detachably connected- With;I the members Y on each' upright,jspacedl vertical parallel guides "on, diametrically opposite sides ofvVsaid upriglitsjparallel thereto and v connected ltosaidIframesmembers,,y a 'base-p vhaving an" upr1ghtfpinfrfor receivingeach .upright tli'ereover, said uprights being 'of-tubular formation ofuniform diameterto per# -mit tlieplatforin and frame members togjbeloweredto the base.

2. In aI porte ble scaold, arplfurlalf,v of

- Y f standards eacli Vhaving single uprightyal pair of y'frame membersVon opposite sides otand extending.horizontally vat right 'angles totlieuprights, ai platform ezdgen'dingvbve-V` tween and detacliablyoonnected Witlifthe f tlie 'vvi'ndlassv is actuated. f v

Vliil'e I have shown Vand)described myin-A venti'on in a preferred form,I am] aware that various changes` and modications may be made Withoutdepartingvromtheprinci-j ples Vot my invention, Vthe Scope of-vvhicli isto be determined zby the appended claims.

Y 1..' In a portable 'scali'old a pluralityl Q standardsV e-afcliliaving a single upright, a,

Y members on each yup-right," spaced vertioal parallel guides ondiametrically oppositev of. the yframe membersk and sides of saiduprightsfparallel thereto and conneotedto saidframe members, ya-base onv .which eacli-V upright is mount/ed,l al Windlass ,Y v0in each/pairy ofguides, vafslieave mounted 'on n the upper end of eacli'fiupriglit,fandacable' f connected; to each ywindlass and etending overa slieaveVWitlitlieopposite end of 'each Y .cableanclioredto cause raising orlowering platforms when nectedv to the' Vw'vindlasses `and trained over,

Wlienfthe `Windlasses are operated,lv a second platform disposedlaterallyfrom andinovableVV verticallyl .with the first platform,l`yup-v 'tlie sheaves, the opposite ends of the vcables 'being connected'to'l the guidesontliefoppof site sides ofthefupriglits tocause"raisingvffgi andlovvering ottlife frames and 'platforms y rightposts for,supporting tlie outer extremrity of .the second'platform, andIdetachable clamping connections carried by the outer,l

end Vot the seoondplat'form-and movable-VV Vover ltliefposts oroperativeto clampsthe 'posts and support'thepouter ends oiftli'es'ec-Q'ondplati-orm. Y i

